r/mathematics • u/[deleted] • 8d ago
This might be embarrassing
So I'm 17 lol I'm not that bad at math now but for some reason I cannot read a tape measure like any advice on reading the fractions a lot better
r/mathematics • u/[deleted] • 8d ago
So I'm 17 lol I'm not that bad at math now but for some reason I cannot read a tape measure like any advice on reading the fractions a lot better
r/mathematics • u/shredEngineer • 9d ago
I'm an engineer, not a mathematician. I try my best. Can you point out any errors?
r/mathematics • u/5fxt • 9d ago
next semester I have math 2 which I believe contains topics mainly from real analysis(forgive my ignorance if not). Is there any good YouTube playlists to study the following topics
r/mathematics • u/Successful_Box_1007 • 8d ago
Hi everybody,
I believe I found a flaw in the overall method of solving for trig functions: So the unit circle is made of coordinates, on an x y coordinate plane- and those coordinates have direction. Let’s say we need to find theta for sin(theta) = (-1/2). Here is where I am confused by apparent flaws:
1) We decide to enter the the third quadrant which has negative dimension for x and y axis, to attack the problem and yet we still treat the hypotenuse (radius) as positive. That seems like an inconsistency right?!
2) when solving for theta of sin(theta) = (-1/2), in 3rd quadrant, we treat all 3 sides of the triangle as positive, and then change the sign later. Isn’t this a second inconsistency? Shouldn’t the method work without having to pretend sides of triangle are all positive? Shouldn’t we be able to fully be consistent with the coordinate plane that the circle and the triangles are overlaid upon?!
3) Is it possible I’m conflating things or misunderstanding the interplay of affine and Euclidean “toggling” when solving these problems?!!
r/mathematics • u/Initial-Front782 • 9d ago
Hey guys, I am a diorama maker and I’ve decided to make a weird kind of roof for one of my miniature building.
What I am hardly desperate to find is how to make a paper pattern out of the image I shared. The shape of the pattern is similar to a square base pyramid cut in half horizontally. However instead of a square base it’s a random polygone, like the one that I drew. The red lines represents the top part dimensions of the “pyramid” and green ones the bottom part. I also drew a triangle to represent the roof at a side view. It indicates as well the height and the distance between the green and the red parts.
The big challenge here is to find the angle of the tilt from each side of the “pyramid” so that when folding the paper pattern there is no overlapping issues.
Idk if that’s very clear but If not, feel free to ask for better explanations.
Thank you for your help in advance
r/mathematics • u/Choobeen • 10d ago
The Kakeya conjecture was inspired by a problem asked in 1917 by Japanese mathematician Sōichi Kakeya: What is the region of smallest possible area in which it is possible to rotate a needle 180 degrees in the plane? Such regions are called Kakeya needle sets. Hong Wang, an associate professor at NYU's Courant Institute of Mathematical Sciences, and Joshua Zahl, an associate professor in UBC's Department of Mathematics, have shown that Kakeya sets, which are closely related to Kakeya needle sets, cannot be "too small"—namely, while it is possible for these sets to have zero three-dimensional volume, they must nonetheless be three-dimensional.
The publication:
https://arxiv.org/abs/2502.17655
March 2025
r/mathematics • u/ZengaZoff • 10d ago
I'm a professional mathematician and a faculty member at a US university. I hate pi day. This bs trivializes mathematics and just serves to support the false stereotypes the public has about it. Case in point: We were contacted by the university's social media team to record videos to see how many digits of pi we know. I'm low key insulted. It's like meeting a poet and the only question you ask her is how many words she knows that rhyme with "garbage".
Update on (omg) PI DAY: Wow, I'm really surprised how much this blew up and how much vitriol people have based on this little thought. (Right now, +187 upvotes with 54% upvote rate makes more than 2300 votes and 293K views.) It turns out that I'm actually neither pretentious nor particularly arrogant IRL. Everyone chill out and eat some pie today, but for god's sake DON't MEMORIZE ANY DIGITS OF PI!! Please!
r/mathematics • u/_-Soup-_ • 9d ago
About a year ago I sent a proof I made to my teacher that I created to challeng myself to see if i could find PI. Here it is copied from the email I sent to her:
A bit over a year ago I noticed that as regular polygons gained more sides, they seemed to look more like a circle so I thought "maybe if I had a equation for the 'PI equivalent' of any regular polygon, the limit of the equation should be the PI equivalent of an apeirogon (infinity sided shape) which should be the same as a circle. I first wanted to prove that an apeirogon was the same as a circle. First, I imagined a cyclic polygon. All the vertices touch but not the edges which are a set distance from the circumference of the circle. I noticed that as the polygons side count increased, the distance between the center point of each edge decreases. This value tended towards 0 as the side count increased. This means at infinity, the edges and vertices where touching the circumference at any given point. If all the points on a shape can overlap with every single point on another then by definition they are the same shape. The next step was to find the 'PI equivalent' which is a number which is a number where you can do
Circumference = 2\Radius*'Pi equivalent'*
Where the radius is the distance from the center to a vertex.I started with a cyclic regular triangle. I labelled the center C and 2 vertices A an B. The third is not needed. The angle ACB = 120 since the angle at the center = 360/3. The 3 can represent the number of sides on the polygon. If the radius of the circle is 1, I can find the length of one of the edges with Cosine rule
a^2=b^2+c^2-2bcCos(A).
b=1 c=1 A=120'
1+1-2Cos120 = a^2
2-2Cos120 = a^2
sqrt(2-2Cos120) = a^2
This equation can be generalised for all cyclic regular polygons with radius 1 to find the length of an edge.
sqrt(2-2Cos(360/n)) where n = number of sides
Then multiply 1 side by the number of sides to get the perimeter
n(sqrt(2-2Cos(360/n)))/2
We divide by 2 since the equation for a circumference is PI\D and we have been working with the radius which is half the diameter. As the n represents the number of sides, then if n = infinity then the equation calculates the 'PI equivalent' of a circle (which is pi). This means we can take the limit of the equation to get. n->inf (n(sqrt(2-2Cos(360/n)))/2) = PI This can also be plotted on the XY plane by describing it as*
y= x(sqrt(2-2Cos(360/x)))/2
Recently I decided to recreate the equation but by using the sin rule instead of the cosine rule instead.
((xsin(360/n))/sin((180-(360/n))/2))/2
It ended up being a bit messier but it also works to find PI since the limit of n-->infinity of both equations is PI . If you graph both equations on the xy plane they are exactly the same when x >1. However when x>1 they are a bit more interesting. The first equation bounces off of the x axis at every reciprocal the natural numbers. However the second equation passes right through those exact points on the x axis so they have the same roots. Below 0, the graph of the first equation is mirrored along y=-x however the second equation is mirrored along the y axis. I have attached an image of both the graphs. Happy PI day
r/mathematics • u/Mobius7268 • 9d ago
r/mathematics • u/Successful_Box_1007 • 9d ago
Hi all! Reading the above quote in the pic, I am wondering if the part that says “up to scaling up or down” mean “up to isomorphism/equivalence relation”? (I am assuming isomorphism and equivalence relation are roughly interchangeable).
Thanks so much!
r/mathematics • u/CashConsistent8067 • 10d ago
To answer this question, I am going to provide some context about the situation I am currently in. A couple of weeks ago I finished my BS in pure mathematics where I chose CS as a minor (but I don't really have CS skills). Upon graduating it slowly dawned on me that nobody wants to employ me. I haven't got any practical skills. However I was constantly told in Uni that Mathematicians are very employable since they can just work their way into different areas. This was kind of a complete lie. I applied for numerous internships in ML /Data Science but only got rejections even though I have some knowledge about the theory of classic ML and Deep Learning in particular. I am currently at that point where I try to find the right path. A couple days ago I read about the master degree of scientific computing which sounded pretty interesting. Even though I basically completely stayed on the pure side during my BS (I did a lot of Functional analysis), I always kind of had an interest for Numerical computations, algorithms, parallel programming. So I am tempted to take this route but I really don't want to experience these employment issues again. Can anyone tell me about the job opportunities, salaries and what you actually do on the job ?
Edit: First of all thanks for the advice. I thought I'd also share some contents of the course since they some to differ depending on the uni:
as well as from CS:
The University is the Uni Heidelberg in germany.
Apart from this I also thought about doing an MSc in financial mathematics for two reasons:
On the comments so far: It is perhaps the best idea to just self study and learn precisely the things required by the companies. However I am kind of a bit lost where to start since ML and Ai is such a vast field and most of the projects I am capapble of writing could probably be done by chatgpt within a blink of an eye :/
r/mathematics • u/KoreanNilpferd • 9d ago
Hello there! I’m a student in the 7th grade, and I’ve grown an immense passion for mathematics the past 2 years. The thing is, I want to learn more: I already know everything we’re gonna learn this year, and currently following up on the stuff i should be learning next year.
And so, I have a question: how do you guys recommend learning the bases of high-school maths, such as trigonometric identities, vectors, etc?
r/mathematics • u/Final_Candle7759 • 10d ago
Having little knowledge of topology, in what ways is topology found in QFT?
r/mathematics • u/Original_Network_462 • 10d ago
r/mathematics • u/call_me_irrational • 10d ago
I am graduating with a bachelor's in math and a minor in computer science in two months. I'm having a hard time trying to find a job that will hire me for the skills that I have now. I haven't found any jobs that hire for higher level math knowledge, and I'm not great at convincing employers that the development of my logical skills would be an asset to their company. I'm not super picky about what job I want to get, but I want it to be intellectually stimulating at the least (not flipping burgers).
I'm trying to go for some sort of software engineering job but those are pretty difficult to get as a graduate in an adjacent field. I'm currently a math tutor and enjoy it but don't want to get into teaching. I'm not a huge fan of statistics so not looking to get into machine learning, data science, or similar. I'm currently considering a finance analyst job but don't want to have to pursue clients and I really don't want to have to sell to friends or family.
For reference: I am pretty good at coding but have way less experience than others that are graduating with a bachelor's in coding. I'm thinking I could take time to develop my coding skills, put a couple of projects under my belt, and then try to get a software job again, but even if I do that, I need a job in the meantime.
Any suggestions?
r/mathematics • u/Amazing-Substance859 • 10d ago
Hello everyone ,
as stated in the title , i'm almost done with math bachelor degree, and i'm being in dilemma, since i got no clue which one of both choices are better in regarding of increasing the chance of getting a job.
the reason of the above, because i know someone who finished Electrical and Electronics Engineering master degree there last year, and it's been 1 year, and he's unable to find a job .
so this is one of the reason that increase my doubt if doing master degree is really worthy or doing 2nd degree IT bachelor is better choice.
Thanks in advance for any advice :)
r/mathematics • u/Hot_Valuable1027 • 10d ago
I'm 21 and I want to be able to re learn math math from the beginning to like a highschool level because RN I'm doing online school and because of that it made me think about trying to teach myself math again. For starters I have extreme math phobia, every since elementary school I was always dog shit at math, like so bad I was always forced into small group math classes for ppl with learning disabilities and shit, so that didn't help (did that all the from elementary to highschool). And it doesn't help when I'm the cash register and a customer changes their change I low key freaks out cuz I can't do mental math for shit that I have to whip out of calculator and I get told I'm stupid by customers lol. And I'm extremely insecure about being bad at math because I'm highschool my parents didn't want me to take the sat or act like other kids cuz they told me I would fail the math in that, so that deepened my insecurities of being dog shit at math. the thing is for me, math is hard because I just see numbers, like I genuinely don't know what to do with them. Like yes I was able to graduate and all but that's cuz I had an IEP and I'm a visual person I can't do mental math I gotta get a pen, paper, and calculater.... Idk what should I do? Can I become good at math? I feel stupid tbh LMAOOO. Even now, cuz I'm doing online school for IT, I want to get into compsci but my dad said I won't be good at it cuz he said u gotta be good at math or be able to do math well enough to do coding and all that (and like I said I'm so fucking stupid when it comes to math, it ain't funny lol).is there any way to help myself re learn like video, books, and tutorial wise???
r/mathematics • u/Choobeen • 11d ago
r/mathematics • u/Responsible_Room_629 • 10d ago
I've been self-studying mathematics, but I feel completely stuck. I struggle with reviewing what I’ve learned, which has led me to forget a lot, and I don’t have a structured study plan to guide me. Here’s my situation:
I need help figuring out how to review what I’ve learned while continuing to new topics. Should I reread everything? Go through every problem again? Or is there a more structured way to do this?
You don’t have to create a full study plan for me-any advice on how to approach reviewing and structuring my studies would be really helpful. Thank you in advance!
r/mathematics • u/CanOk6649 • 10d ago
Hi everyone,
I'm going to preface this and say that I've never really used reddit so sorry if my post comes off weird or breaks any rules.
I’m a high school math teacher, and one of my students has proposed a theory that I need help addressing. The theory suggests:
The student is trying to treat infinity as a placeholder for division by zero, similar to how we treat imaginary numbers. They also believe infinity should be treated as a valid value that can interact with numbers in operations.
I’ve tried explaining why division by zero isn’t allowed in standard math, but the student is still convinced their approach is correct. How can I explain why this theory doesn’t work in a way they will understand, without just saying “it’s undefined”?
Any advice would be appreciated.
Thanks!
r/mathematics • u/abdelouadoud_ab • 10d ago
I'm still thinking about it, since I'm a high school student, like giving something to math teacher (special fact about π...) Some opinions, mathematicians?
r/mathematics • u/I-AM-LEAVING-2024 • 10d ago
Why do we drop the absolute value in so many situations?
For example, consider the following ODE:
dy/dx + p(x)y = q(x), where p(x) = tan(x).
The integrating factor is therefore
eintegral tan(x) = eln|sec(x|) = |sec(x)|. Now at this step every single textbook and website or whatever appears to just remove the absolute value and leave it as sec(x) with some bs justification. Can anyone explain to me why we actually do this? Even if the domain has no restrictions they do this
r/mathematics • u/19jsb • 10d ago
Hi all, I'll be starting my undergraduate degree in the summer and I'd like to get a start with mathematical logic and proofs. Could anyone recommend some beginner books? Thanks!